WEST801+GOAL.UC Replacement knob lock Defective locking due to improper installation

"I can't lock it from the inside, so I'd like to check it."

I moved in today, but I'm told that it won't be locked.If I made a complaint to a real estate agent, I was told to contact me and I got a call.

It looks like a knob when I look it up on Google MAP photos, but is it a phenomenon caused by improper installation?

After all it was WEST801.This is a common phenomenon and is a defect caused by work mistakes after a new replacement.

If the 360 ​​° cylinder turns when unlocked and locked, the position of the square core shaft is incorrect.If installed in the correct position, it will rotate 180 °.

It is restored by disassembling and reassembling.It seems that there are various locksmiths, and there are many shortages of confirmation.